Is protest political?

In most cases, yes. Although some may be within different part of politics which makes the question confusing.

In all, I would say yes, and it depends.

It depends if your protesting for a political party. If it is a simple, for instance, pollution or climate change protest, it doesn't necessarily have to be!!

yes

explanation:

why

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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